Put lemon, maraschino cherries with juice, unflavored gelatin, sugar, and hot pineapple juice into blender. Blend ingredients until gelatin is dissolved and cherries liquefied. Turn off blender and scrape down sides of blender. Add cream and ice to blender. Blend mixture until mixture begins to thicken. Pour at once into sherbet glasses. Top with whipped cream and garnish with cherries. Serve at once. Makes 6 to 8 servings.